John K. Mahon and Romana Danysh, CMH 60-3: Infantry, Part I: Regular Army…
“ The tenth company in a British battalion was called the "light company." Light companies were also detached and consolidated into provisional battalions, but as often they were assigned a truly light mission, that is, to advance ahead of the line, screen it, and demoralize the enemy. This mission of light infantry in the American service was usually performed by rifle units, which fanned out in front of the army and, with their accurate fire, galled the enemy severely. At first there was no counterpart to flank companies in the Continental infantry. ”
